Fix #2780: Show embedded resource size

ICSharpCode.Decompiler/Metadata/Resource.cs

@@ -40,6 +40,7 @@ namespace ICSharpCode.Decompiler.Metadata
 		public virtual ManifestResourceAttributes Attributes => ManifestResourceAttributes.Public;
 		public abstract string Name { get; }
 		public abstract Stream? TryOpenStream();
+		public abstract long? TryGetLength();
 	}
 
 	public class ByteArrayResource : Resource
@@ -57,6 +58,11 @@ namespace ICSharpCode.Decompiler.Metadata
 		{
 			return new MemoryStream(data);
 		}
+
+		public override long? TryGetLength()
+		{
+			return data.Length;
+		}
 	}
 
 	sealed class MetadataResource : Resource
@@ -126,6 +132,29 @@ namespace ICSharpCode.Decompiler.Metadata
 				return null;
 			return new ResourceMemoryStream(Module.Reader, ptr + sizeof(int), length);
 		}
+
+		public unsafe override long? TryGetLength()
+		{
+			if (ResourceType != ResourceType.Embedded)
+				return null;
+			var headers = Module.Reader.PEHeaders;
+			if (headers.CorHeader == null)
+				return null;
+			var resources = headers.CorHeader.ResourcesDirectory;
+			if (resources.RelativeVirtualAddress == 0)
+				return null;
+			var sectionData = Module.Reader.GetSectionData(resources.RelativeVirtualAddress);
+			if (sectionData.Length == 0)
+				return null;
+			var resource = Module.Metadata.GetManifestResource(Handle);
+			if (resource.Offset > sectionData.Length)
+				return null;
+			byte* ptr = sectionData.Pointer + resource.Offset;
+			int length = ptr[0] + (ptr[1] << 8) + (ptr[2] << 16) + (ptr[3] << 24);
+			if (length < 0 || length > sectionData.Length)
+				return null;
+			return length;
+		}
 	}
 
 	sealed unsafe class ResourceMemoryStream : UnmanagedMemoryStream

ICSharpCode.ILSpyX/LoadedPackage.cs

@@ -147,6 +147,7 @@ namespace ICSharpCode.ILSpyX
 			public override string FullName => originalEntry.FullName;
 			public override ResourceType ResourceType => originalEntry.ResourceType;
 			public override Stream? TryOpenStream() => originalEntry.TryOpenStream();
+			public override long? TryGetLength() => originalEntry.TryGetLength();
 		}
 
 		sealed class ZipFileEntry : PackageEntry
@@ -176,6 +177,16 @@ namespace ICSharpCode.ILSpyX
 				memoryStream.Position = 0;
 				return memoryStream;
 			}
+
+			public override long? TryGetLength()
+			{
+				Debug.WriteLine("TryGetLength " + Name);
+				using var archive = ZipFile.OpenRead(zipFile);
+				var entry = archive.GetEntry(Name);
+				if (entry == null)
+					return null;
+				return entry.Length;
+			}
 		}
 
 		sealed class BundleEntry : PackageEntry
@@ -217,6 +228,11 @@ namespace ICSharpCode.ILSpyX
 					return decompressedStream;
 				}
 			}
+
+			public override long? TryGetLength()
+			{
+				return entry.Size;
+			}
 		}
 	}
 

ILSpy/TreeNodes/ResourceNodes/ResourceTreeNode.cs

@@ -67,7 +67,9 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 		public override void Decompile(Language language, ITextOutput output, DecompilationOptions options)
 		{
-			language.WriteCommentLine(output, string.Format("{0} ({1}, {2})", Resource.Name, Resource.ResourceType, Resource.Attributes));
+			var sizeInBytes = Resource.TryGetLength();
+			var sizeInBytesText = sizeInBytes == null ? "" : ", " + sizeInBytes + " bytes";
+			language.WriteCommentLine(output, $"{Resource.Name} ({Resource.ResourceType}, {Resource.Attributes}{sizeInBytesText})");
 
 			ISmartTextOutput smartOutput = output as ISmartTextOutput;
 			if (smartOutput != null)